3.
A student uses a solution that contains 16 grams of water to conduct an evaporation
experiment.
At the end of one hour, the amount of water in the solution has decreased
by 3.5%.
. At the end of two hours, the amount of water in the solution has decreased
by another 4.25%.
Which calculations can be used to determine the amount of water, in grams, remaining
in the solution at the end of the second hour?

14.7838

Explanation:

Given that;

A student uses a solution that contains 16 g of water to conduct an experiment and at the end of an hour ; the amount have decreased by 3.5%

The mathematically illustration for this is given as

= 16 g ×  3.5%

=

= 0.56  

After an hour; the amount have decreased by 16 - 0.56

= 15.44

after 2 hours the water decreased by another 4.25%

i.e  

⇒ 0.6562

after two hours , the amount would have decreased by:

= 15.44 - 0.6562

= 14.7838